Process of obtaining a soluble glutinous substance from tang-acid.



No. 872,179. PATENTED NOV. 26, 1907. B. HERRMANN. PROCESS OF OBTAINING ASOLUBLE GLUTINOUS SUBSTANCE FROM TANG ACID.

APPLICATION FILED MAY 9, 1906- 2 a --.'....;l....l......,. J T

WIT SSES 6 a I glfafi. 1'

.UNITED STATES PATENT oFFroE.

ERNEST HERRMANN,

OF PARIS, FRANCE, ASSIGNOR TO OOMPAGNIE INTERNATIONALE LA NORGINE, orPARIS, FRANCE.

I r I PROCESS OF OBTAINING A. SOLUBLE GL'U'IINOUS SUBSTANCE FROMTANG-ACID.-

4 Specification of Letters Patent. Application filed May 9,19Q6- SeiialNo. 816.001. (Specimens) Patented Nov. 26, 1907:

To all whom it may concern:

Be it known that I, ERNEST HERRMANN, a citizen of the Republic ofFrance, residingat Paris,F1-ance, 78 Rue dAnjou, have invented new anduseful Improvements in Method of Obtaining a Soluble Glutinous-Substancein 'a Dry and Neutral State from Tang-Acid,

of which the following is a specification.

This invention relates to a method of obtaining a soluble glutinoussubstance in a dry and neutral state from tang-acid.

The method of procedure is as follows Tang-acid having been obtained inaccordance with the methods already known (see United States Patents N0. 598,790 of November 21st 1896 and No. 737,421 of May 19th 1902),either directly from tangate of soda by precipitation with theassistance of an again pressed.

acid or by washing tangate of lime with an acid, is subjected topressure in a cold state, then heated, either by being plunged intoboiling water or by the action of steam, and The tang-acid may also bepressed in heated molds. The pressure thus applied to the hot tang-acidenables a far larger quantity of waterto be eliminated than bycoldprocess while the cold pressed tangacid contains only about 20 percent of soli products, the hot. pressed tang-acid may contain 40 percent of such products, approximately. The tang-acid may then be oundedwithout re-a glomerating, whereby it is obtained in the orm of powder.The said powder is then subjected to the action of ammonia vapor, eitherby being-arranged in thin layers on an endless band which is carried inthe opposite direction to that of the ammonia vapor, or by placing samein 'mnt of tang-acid with apparatus in which it is constantly agitated,such asslowly rotating casks with fixed paddles in the interior, all incommunication, so

m a drying-room or dryin -st ove the heat of which also serves to deprive 1t of the form of tangate of ammonia, which is absolutely. dry,perfectly neutral and -per fectly soluble. Its condition in the form ofpowder also facilitates its being dissolved, as it previouslyfacilitated its drying.

The accompanying drawing shows in spational elevation an apparatus forsubjectlng the ppwder to the action of ammonia vapors. In t 's drawin 1is a hopper for feeding the tang-acid pow er and 2 1s a pi e for feedingan ammoniacal solution to t c vat 3 in which is mounted astirrer 4,1otating in the direction of the arrow 5.

The proportion of substances introduced in the vat 3 are as follows: i

87 parts ofwe i ght.

Tang-acid Ammoniacal solution 13 or a proximatively 15 of ammonia.

T e stirred mixture of tang-acid and ammonia is dischar ed through thespout 6 of the vat 5, into a unnel 7 placed at the top of a box 8,containing two rollers 9, rotating on their axles 10, actuated by anyconvenient means in opposite directions (see arrows) beneath the spoutof funnel 7. The box 8 contains a series of superposed endless belts 11,supported b rollers 12 and moving 1n the direction in icated by arrows,so as to convey the material successively to the discharge of apparatus.13, 13, are horlzontal partitions between the different endless belts. Acompartment 1% is disposed beneath the box 8, and this compartment isoccupied by steam heating pipes 15, and by a centrifugal blower 16 atone end of the compartment. The heated air asses up through the a erture17 in the ottom of the box 8 an in meetin the material carried on by theendless be ts, the said hot air successively vaporizes the ammonia anddries the material. 18 is a chimney for the escape of the ammonia va01's. Finally the tangate of ammonia is ischarg'ed at l9 and it is nowready to be packed up m any convenient manner.

The product is essentially intended to be used for sizing, dressing. orfinishing textile products.

Having now described my invention, what Iclaim asnew and desire tosecure by Letters Patent is:

Process of producing a glutinous substance which shall e dry, neutraland perfectly I soluble, by' pressing tang-acid while in a heated'state,reducing the resulting product 'to a powder and subjecting it to theaction of ammonia Vapor or treating it with ammonia 5 gas, drying and atthe same time freeing said I product from any excess of ammonia which itmay contain, substantially in the manner described.

In testimony whereof I have signed my. name to this specification in thepresence of 10 two subscribing witnesses.

ERNEST HERRMANN'.

Witnesses:

ERIK S. BECKER, J12, HANSON O. OoXE.

